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Core components supporting the Micronaut Framework
/*
* Copyright 2017-2021 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.aop.chain;
import io.micronaut.aop.*;
import io.micronaut.context.BeanContext;
import io.micronaut.context.BeanRegistration;
import io.micronaut.context.BeanResolutionContext;
import io.micronaut.context.DefaultBeanContext;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.annotation.NonNull;
import io.micronaut.core.annotation.Nullable;
import io.micronaut.core.annotation.UsedByGeneratedCode;
import io.micronaut.core.beans.BeanConstructor;
import io.micronaut.core.type.Argument;
import io.micronaut.core.util.ArrayUtils;
import io.micronaut.inject.AdvisedBeanType;
import io.micronaut.inject.BeanDefinition;
import io.micronaut.inject.annotation.AnnotationMetadataHierarchy;
import io.micronaut.inject.qualifiers.Qualifiers;
import java.util.*;
/**
* Implementation of {@link InvocationContext} for constructor interception.
*
* @param The bean type
* @author graemerocher
* @since 3.0.0
*/
@Internal
@UsedByGeneratedCode
public final class ConstructorInterceptorChain extends AbstractInterceptorChain implements ConstructorInvocationContext {
private final BeanConstructor beanConstructor;
private Object[] internalParameters = ArrayUtils.EMPTY_OBJECT_ARRAY;
/**
* Default constructor.
*
* @param beanConstructor The bean constructor
* @param interceptors The method interceptors to be passed to the final object to be constructed
* @param originalParameters The parameters
*/
private ConstructorInterceptorChain(
@NonNull BeanConstructor beanConstructor,
@NonNull Interceptor[] interceptors,
Object... originalParameters) {
super(interceptors, originalParameters);
this.beanConstructor = Objects.requireNonNull(beanConstructor, "Bean constructor cannot be null");
}
/**
* Default constructor.
*
* @param beanDefinition The bean constructor
* @param beanConstructor The bean constructor
* @param interceptors The interceptors
* @param originalParameters The parameters
* @param additionalInterceptorParametersCount The additional interceptor parameters count
*/
@UsedByGeneratedCode
private ConstructorInterceptorChain(
@NonNull BeanDefinition beanDefinition,
@NonNull BeanConstructor beanConstructor,
@NonNull Interceptor[] interceptors,
int additionalInterceptorParametersCount,
Object... originalParameters) {
this(beanConstructor, interceptors, resolveConcreteSubset(beanDefinition, originalParameters, additionalInterceptorParametersCount));
internalParameters = resolveInterceptorArguments(beanDefinition, originalParameters, additionalInterceptorParametersCount);
}
@Override
@NonNull
public InterceptorKind getKind() {
return InterceptorKind.AROUND_CONSTRUCT;
}
@Override
public T getTarget() {
throw new UnsupportedOperationException("The target cannot be retrieved for Constructor interception");
}
@Override
public T proceed() throws RuntimeException {
Interceptor interceptor;
if (interceptorCount == 0 || index == interceptorCount) {
final Object[] finalParameters;
if (ArrayUtils.isNotEmpty(internalParameters)) {
finalParameters = ArrayUtils.concat(getParameterValues(), internalParameters);
} else {
finalParameters = getParameterValues();
}
return beanConstructor.instantiate(finalParameters);
} else {
interceptor = this.interceptors[index++];
if (LOG.isTraceEnabled()) {
LOG.trace("Proceeded to next interceptor [{}] in chain for constructor invocation: {}", interceptor, beanConstructor);
}
return interceptor.intercept(this);
}
}
@Override
public @NonNull
Argument[] getArguments() {
return beanConstructor.getArguments();
}
@Override
public T invoke(T instance, Object... arguments) {
throw new UnsupportedOperationException("Existing instances cannot be invoked with Constructor injection");
}
@Override
@NonNull
public BeanConstructor getConstructor() {
return beanConstructor;
}
/**
* Internal methods that handles the logic of instantiating a bean that has constructor interception applied.
*
* @param resolutionContext The resolution context
* @param beanContext The bean context
* @param interceptors The interceptors. Can be null and if so should be resolved from the context.
* @param definition The definition
* @param constructor The bean constructor
* @param parameters The resolved parameters
* @param The bean type
* @return The instantiated bean
* @since 3.0.0
*/
@Internal
@UsedByGeneratedCode
@NonNull
@Deprecated
public static T1 instantiate(
@NonNull BeanResolutionContext resolutionContext,
@NonNull BeanContext beanContext,
@Nullable List>> interceptors,
@NonNull BeanDefinition definition,
@NonNull BeanConstructor constructor,
@NonNull Object... parameters) {
int micronaut3additionalProxyConstructorParametersCount = 3;
return instantiate(resolutionContext, beanContext, interceptors, definition, constructor, micronaut3additionalProxyConstructorParametersCount, parameters);
}
/**
* Internal methods that handles the logic of instantiating a bean that has constructor interception applied.
*
* @param resolutionContext The resolution context
* @param beanContext The bean context
* @param interceptors The interceptors. Can be null and if so should be resolved from the context.
* @param definition The definition
* @param constructor The bean constructor
* @param additionalProxyConstructorParametersCount The additional proxy constructor parameters count
* @param parameters The resolved parameters
* @param The bean type
* @return The instantiated bean
* @since 3.0.0
*/
@Internal
@UsedByGeneratedCode
@NonNull
public static T1 instantiate(
@NonNull BeanResolutionContext resolutionContext,
@NonNull BeanContext beanContext,
@Nullable List>> interceptors,
@NonNull BeanDefinition definition,
@NonNull BeanConstructor constructor,
int additionalProxyConstructorParametersCount,
@NonNull Object... parameters) {
if (interceptors == null) {
final AnnotationMetadataHierarchy hierarchy = new AnnotationMetadataHierarchy(definition.getAnnotationMetadata(), constructor.getAnnotationMetadata());
final Collection> annotationValues = resolveInterceptorValues(hierarchy, InterceptorKind.AROUND_CONSTRUCT);
final Collection>> resolved = ((DefaultBeanContext) beanContext).getBeanRegistrations(
resolutionContext,
Interceptor.ARGUMENT,
Qualifiers.byInterceptorBindingValues(annotationValues)
);
interceptors = new ArrayList(resolved);
}
final InterceptorRegistry interceptorRegistry = beanContext.getBean(InterceptorRegistry.ARGUMENT);
final Interceptor[] resolvedInterceptors = interceptorRegistry
.resolveConstructorInterceptors(constructor, interceptors);
return Objects.requireNonNull(new ConstructorInterceptorChain(
definition,
constructor,
resolvedInterceptors,
additionalProxyConstructorParametersCount,
parameters
).proceed(), "Constructor interceptor chain illegally returned null for constructor: " + constructor.getDescription());
}
private static Object[] resolveConcreteSubset(BeanDefinition beanDefinition,
Object[] originalParameters,
int additionalProxyConstructorParametersCount) {
if (beanDefinition instanceof AdvisedBeanType) {
// intercepted bean constructors include additional arguments in
// addition to the arguments declared in the bean
// Here we subtract these from the parameters made visible to the interceptor consumer
if (originalParameters.length < additionalProxyConstructorParametersCount) {
throw new IllegalStateException("Invalid intercepted bean constructor. This should never happen. Report an issue to the project maintainers.");
}
return Arrays.copyOfRange(
originalParameters,
0,
originalParameters.length - additionalProxyConstructorParametersCount
);
}
return originalParameters;
}
private static Object[] resolveInterceptorArguments(BeanDefinition beanDefinition,
Object[] originalParameters,
int additionalProxyConstructorParametersCount) {
if (beanDefinition instanceof AdvisedBeanType) {
// intercepted bean constructors include additional arguments in
// addition to the arguments declared in the bean
// Here we subtract these from the parameters made visible to the interceptor consumer
if (originalParameters.length < additionalProxyConstructorParametersCount) {
throw new IllegalStateException("Invalid intercepted bean constructor. This should never happen. Report an issue to the project maintainers.");
}
return Arrays.copyOfRange(
originalParameters,
originalParameters.length - additionalProxyConstructorParametersCount,
originalParameters.length
);
}
return originalParameters;
}
}